Picking up where the sequel left off, Part III of the adventure features the Enterprise crew returning to the port for some essential repairs, only to discover the ship is to be scrapped. Meanwhile, Dr. McCoy is not acting himself, and Capt. Kirk is forced to steal back his old ship, flying across space to save a friend in need.

In order to try to save both Spock and McCoy's sanity,
Admiral Kirk disobeys direct Starfleet orders by stealing back the
old Enterprise, scheduled for dismantling, and with his old crew
return to the forbidden planet, Genesis, to find Spock.

After Admiral Kirk talks to Dr. McCoy, who is
acting strangely, and finds out from Sarek (Mark Lenard), that
Spock had mind-melded with Dr. McCoy, giving him his Contra, before
dying, (at the end of Star Trek 2), Kirk and his loyal crew plan
to steal the Enterprise with the goal of taking Spock's body and
Dr. McCoy back to the planet, Vulcan, where Spock's Contra can
be transferred from Dr. McCoy, back into Spock's body.

Kirk: "You're suffering from a Vulcan mind-meld,
doctor".
Dr. McCoy: "That green-blooded son of a bitch! It's his revenge
for all the arguments he lost."

Knowing that they would be kissing their careers
good-bye, Kirk and the others successfully steal the ship, and
go to the very unstable planet, Genesis, where the man-made process
of creating life was experimented with, (Star Trek 2:The Wrath
of Khan). The project was a failure, as it created an unregulated,
unstable life cycle that will ultimately destroy the planet.

After the crew steals the Enterprise, Captain
Kirk comments: "Gentlemen, your work today has been outstanding
and I intend to recommend you all for promotion... in whatever
fleet we end up serving."

Meanwhile, another federation science vessel,
who was still studying the unstable planet, had sent Dr. David
Marcus (Merritt Butrick), Kirk's son, and a female Vulcan officer,
Lieutenant Saavik (Robin Curtis), down to the planet's surface
to investigate a life form reading. They find that cells from
Spock's body had regenerated in this volatile environment into
a Vulcan boy, void of a contra, who is growing at an accelerated
rate. Before they can beam him up, the dastardly Klingons, led
by Commander Kruge (Christopher Lloyd) arrive and destroy the
science vessel, stranding the three of them on the planet.

It seems that the Klingons are interested in learning
the secrets of Genesis, in order to use it as a weapon against
their enemies, which would be to them just an act of self-preservation.
They go down to the planet and capture David, Saavik and the Vulcan
boy. Then, Kirk and the Enterprise crew arrive to find this big
messy situation. In his strategy, James Kirk eventually defeats
the nasty Klingons by sly trickery, but not before personal tragedy
for Kirk occurs.

After defeating the Klingons, Kirk, Saavik, the
Vulcan man and crew limp back to the planet Vulcan in the Klingons
Bird of Prey, hoping to restore both McCoy and Mr. Spock.

The fine direction, by Nimoy, does a great job
of blending the action, dramatic dialog, and humor of the inspired
screenplay, by Harve Bennett, creating a "rock-solid"
Star Trek science fiction story, an exciting space adventure,
that catches the spirit of the previous adventure, "Star
Trek 2: The Wrath of Khan," as it continues from where that
film left off.

William Shatner, as Admiral Kirk, gives us one
of his best performances as a man under stress from all sides,
who suffers personal and career losses, but fulfills his original
self- directed mission: to attempt to save Spock and McCoy, two
men who are close to him.

Mark Lenard once again gives a steady performance
of Ambassador Sarek, Spock's father, who logically convinces Admiral
Kirk to go back to Genesis, rescue Spock's body, and return to
Vulcan with Dr. McCoy in tow, in an attempt to save both men,
despite all the hard obstacles that stand in Kirk's way.

Christopher Lloyd, as the dastardly Kruge, gives
us an enjoyable, hammy performance, as a mean and cruel villain,
uniquely found in Star Trek stories.

DeForest Kelley does a great job as a man tormented
by a Vulcan's Contra, which is part of Spock's soul. Also, Kelley
once again shows his considerable talent in delivering one-liners.
(1) As he was talking to an alien: "Yes, Genesis! How can
you be deaf with ears like that?!" (2) As Kirk wonders, "What
have I just done?". Dr. McCoy answers: "What you had
to do. What you always do: turn death into a fighting chance to
live."

James Doohan (Scotty), Nichelle Nichols (Uhura),
George Takei (Sulu), and Walter Koenig (Chekov) also do an excellent
job in portraying their characters, and all have great line delivery
in this clever script, in both funny and poignant moments.

Scotty comments about his success of disabling
the new starship so it couldn't chase them: "The more they
overthink the plumbing, the easier it is to stop up the drain!"

Robin Curtis, as Lieutenant Sarek is very convincing
as a Vulcan science officer, who helps the young Vulcan boy that
she and Dr. Marcus found on Genesis to survive in dangerous situations
on the planet.

Dame Judith Anderson, an award -winning, knighted
actress, gives dignity and a sense of awe to her role as the high
Vulcan Priestess, T'Lar. This marvelous, 87 year old actress adds
believability to the storyline, and drama to the moment, when
Spock finally returns to Vulcan.

Special Effects and set designs make the story
convincing, adding much to the action of the screenplay. My favorite
set designs are on the planet, Vulcan, Starfleet headquarters,
and on the planet, Genesis.

People who love Star Trek and great science fiction,
will definitely enjoy this 2nd installment of the Spock story.